A multi-stage variable speed drive axle for a tractor

Abstract

The application discloses a multi-stage variable-speed drive axle for a tractor and relates to the technical field of variable-speed drive axles. When the drive axle works, the conical gear pair of the main speed reducer rotates to drive the convex block to rotate, the convex end of the convex block pushes the contact block to move upwards, drives the downward block to extrude the telescopic spring upwards along the outer periphery of the fixed column, and moves along the avoiding groove and the downward groove. When the bottom of the downward block exceeds the flow-through opening, the lubricating oil in the accommodating cavity flows into the downward groove and is closed by the one-way rubber sealing sheet. The convex block continuously rotates, the convex end is separated from the contact block, the telescopic spring rebounds to push the downward block and the contact block to move downwards, the contact block is ensured to keep in contact with the convex block, the downward block extrudes the lubricating oil in the downward groove to push the one-way rubber sealing sheet to open, the lubricating oil flows along the flow-through openings from large to small, the flow rate gradually increases due to the change of the diameters, the lubricating oil collides with the baffle when flowing out along the flow pipe, the liquid film is broken and atomized, diffuses in the drive axle housing, and lubricates the conical gear pair of the main speed reducer and the half shaft.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of variable speed drive axle, in particular to a multi-stage variable speed drive axle for tractor. BACKGROUND

[0002] In the development process of modern agriculture, the importance of tractor as the core equipment of agricultural mechanization is self-evident. As a key component of the tractor, the multi-stage variable speed drive axle plays a crucial role in the transmission system, which bears multiple key functions such as power transmission, speed regulation, differential steering and load bearing. With the rapid development of modern agriculture, higher requirements are put forward for tractors, and high-load operation capability, long service life and low failure rate have become important indicators to measure their performance. However, the design of the current drive axle lubrication system has become a core bottleneck restricting its performance breakthrough.

[0003] Although the prior art can maintain the lubrication of the tractor drive axle by manually adding lubricating oil regularly, this traditional method has obvious drawbacks in high-intensity working environment. Since the tractor cannot be accurately and quantitatively supplied with lubricating oil according to its real-time working state, when the tractor is in heavy load and high speed working condition, severe friction will occur between the main reducer gear and the half shaft. This severe friction will generate a large amount of friction heat, causing the local temperature of the lubricating oil to rise sharply in a short time. The high temperature environment makes the light components in the lubricating oil evaporate rapidly, affecting the performance and quantity of the lubricating oil. As the lubricating oil continues to evaporate and cannot be replenished in time, the lubricating oil film originally evenly covering the gear and bearing surface gradually thins out and eventually breaks, forming an oil film breakage zone. The presence of the oil film breakage zone causes the gear teeth to directly contact each other in the absence of sufficient lubrication, which is prone to cause gear tooth surface pitting under the action of great pressure and friction. At the same time, the bearing is in a dry friction or semi-dry friction state due to the lack of good lubrication, resulting in high bearing temperature and serious bearing ablation, which seriously affects the normal operation and service life of the tractor. SUMMARY

[0004] The purpose of the present application is to solve the problem that the traditional drive axle lubrication system has significant defects in high-intensity work: the friction heat generated by the main reducer gear and the half shaft under heavy load and high speed working conditions causes the local evaporation of the lubricating oil, forming an oil film breakage zone and causing gear tooth surface pitting, bearing ablation and other failures. A multi-stage variable speed drive axle for tractor is proposed.

[0005] In order to achieve the above object, the application adopts the following technical solution: a tractor multi-stage variable speed drive axle comprises a shell, the shell comprises a drive axle housing and a main reducer connected to the side of the drive axle housing, a half shaft is rotatably connected inside the drive axle housing, the output end of the main reducer is connected with the half shaft, and the shell further comprises a lubricating assembly connected to the inside of the main reducer;

[0006] The lubricating assembly comprises a connecting shell connected to the side of the main reducer, the inner wall of the connecting shell is fixed with a connecting block, a cavity is formed in the inside of the connecting block, a downward moving groove is formed in the inside of the connecting block, the downward moving groove is communicated with the cavity through a flow passage, a flow outlet is formed in the inside of the connecting block, a one-way rubber sealing piece is installed in the flow outlet, a groove is formed in one side of the connecting block, a flow pipe communicated with the flow outlet is connected to one side of the groove, a baffle is connected to one side of the groove through an adjusting assembly, and a pressing piece is connected between the inside of the downward moving groove and the inner wall of the connecting shell;

[0007] The main reducer rotates and drives the pressing piece to move in the downward moving groove, so as to extrude the lubricating oil to flow out along the flow outlet.

[0008] Further description of the above-mentioned tractor multi-stage variable speed drive axle:

[0009] The pressing piece comprises an avoiding groove formed in the side of the connecting block, the inner wall of the connecting shell is fixed with a fixed column, a downward moving block is slidably connected to the outer periphery of the fixed column and embedded in the downward moving groove, an extension spring is sleeved on the outer periphery of the fixed column, the bottom of the downward moving block is fixed with a contact block, and the contact block and the output shaft of the main reducer are connected through a protruding block.

[0010] Further description of the above-mentioned tractor multi-stage variable speed drive axle:

[0011] When the downward moving block is on the top of the inner wall of the downward moving groove, the bottom of the downward moving block does not exceed the avoiding groove.

[0012] Further description of the above-mentioned tractor multi-stage variable speed drive axle:

[0013] The channel of the flow outlet is progressively arranged from large to small, an oil filling port is formed in the top of the connecting shell, and a closing screw is threadedly connected to the inner wall of the oil filling port.

[0014] Further description of the above-mentioned tractor multi-stage variable speed drive axle:

[0015] The adjusting assembly comprises a micro electric push rod installed on one side of the groove, a circular plate is connected to the output end of the micro electric push rod, a guide rod is fixed to the side of the groove, an opening is formed in the inside of the circular plate, the circular plate is slidably connected to the outer periphery of the guide rod, and a sliding piece is connected between the circular plate and the baffle.

[0016] Further description of the above-mentioned tractor multi-stage variable speed drive axle:

[0017] The sliding member comprises an inclined block fixed on the side of the connecting block and a plurality of slots opened in the inner part of the round plate, the inner wall of the slot is fixed with a positioning rod, the outer periphery of the positioning rod is slidably connected with a sliding block fixed with the baffle, and the outer periphery of the positioning rod is sleeved with an extrusion spring.

[0018] As a further description of the above-mentioned tractor multi-stage variable speed drive axle:

[0019] The side surface of the baffle is fixed with an abutting block, and the abutting block is in contact with the slot.

[0020] As a further description of the above-mentioned tractor multi-stage variable speed drive axle:

[0021] The shell further comprises a differential mechanism installed on one side of the drive axle housing, and drive wheels connected at both ends of the drive axle housing.

[0022] As described above, due to the adoption of the above-mentioned tractor multi-stage variable speed drive axle, the beneficial effects of the present application are:

[0023] By setting the lubricating assembly and the adjusting assembly, when the drive axle works, the conical gear pair of the main reducer rotates to drive the convex block to rotate, the convex end of the convex block pushes the contact block to move up, drives the downward block to extrude the telescopic spring upwards along the outer periphery of the fixed column, and moves along the avoidance slot and the downward slot, when the bottom of the downward block exceeds the flow-through port, the lubricating oil in the cavity flows into the downward slot and is closed by the one-way rubber sealing piece, the convex block continues to rotate, the convex end is separated from the contact block, the telescopic spring rebounds to push the downward block and the contact block to descend, ensuring that the contact block and the convex block are in contact, the downward block extrudes the lubricating oil in the downward slot, pushes the one-way rubber sealing piece to open, the lubricating oil flows along the flow port from large to small, the flow rate gradually increases due to the change of the caliber, and when the lubricating oil flows out along the flow pipe, it hits the baffle, the liquid film breaks and atomizes, diffuses in the drive axle housing, lubricates the conical gear pair of the main reducer and the half shaft, and the convex block rotates with the conical gear pair of the main reducer, the lubrication frequency increases when the rotating speed is high, and the lubrication frequency decreases when the rotating speed is low, so that the parts can be lubricated in real time according to the running condition, effectively reducing the friction heat and ensuring the stable operation of the parts.

[0024] When heavy load and high speed working condition is encountered, atomized lubricating oil is not enough to reduce friction heat, at this time, the micro electric push rod is started to make it retract, the retracting push rod pulls the round plate, the baffle is moved, the abutting block on the side of the baffle contacts the inclined block on the side of the connecting block, the inclined block pushes the abutting block, the sliding block slides on the outer periphery of the positioning rod and compresses the compression spring, the two baffles gradually move away, the lubricating oil squeezed by the downward block pushes the one-way rubber sealing piece to open, flows along the flow outlet and the flow rate increases, and finally flows out along the flow pipe without being blocked by the baffle, and flows out in the form of water droplets. This water droplet-shaped lubricating oil is more suitable for heavy load and high speed working condition, can fully lubricate the main reducer conical gear pair and half shaft, significantly improves the lubricating effect, further reduces the friction heat, and ensures the stable operation of the drive axle in harsh working condition. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The overall structure schematic diagram according to the present application is shown;

[0026] Figure 2 The internal structure schematic diagram according to the present application is shown;

[0027] Figure 3 The lubricating assembly structure schematic diagram according to the present application is shown;

[0028] Figure 4 The lubricating assembly cross-section structure schematic diagram according to the present application is shown;

[0029] Figure 5 The partial enlarged schematic diagram of B in the present application is shown; Figure 4

[0030] Figure 6 The connecting block structure schematic diagram according to the present application is shown;

[0031] Figure 7 The one-way rubber sealing piece structure schematic diagram according to the present application is shown;

[0032] Figure 8 The partial enlarged schematic diagram of A in the present application is shown; Figure 3

[0033] Figure 9 The round plate structure schematic diagram according to the present application is shown.

[0034] LEGEND:

[0035] 10, shell; 11, drive axle housing; 12, main reducer; 121, differential; 13, half shaft; 14, drive wheel;

[0036] ​​20, lubricating assembly; 21, connecting shell; 211, sealing screw; 22, connecting block; 221, cavity; 222, flow port; 223, avoiding slot; 224, downward slot; 225, flow port; 226, groove; 227, flow pipe; 228, baffle; 229, one-way rubber sealing sheet; 23, protruding block; 24, fixing column; 241, downward block; 242, telescopic spring; 243, contact block;

[0037] 30, adjusting assembly; 31, micro electric push rod; 32, guide rod; 321, round plate; 322, opening; 33, inclined block; 34, slot; 341, positioning rod; 342, extrusion spring; 343, sliding block; 344, abutting block. DETAILED DESCRIPTION

[0038] A multi-stage variable speed drive axle for tractors is clearly and completely described below in the embodiments of the present application in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0039] As shown in the drawings, Figures 1-9 A multi-stage variable speed drive axle for tractors provided by the present application: comprising a shell 10, the shell 10 comprising a drive axle housing 11 and a main reducer 12 connected to the side of the drive axle housing 11, a half shaft 13 is rotatably connected inside the drive axle housing 11, the output end of the main reducer 12 is connected with the half shaft 13, the shell 10 further comprises a differential 121 installed on one side of the drive axle housing 11, and drive wheels 14 connected at both ends of the drive axle housing 11, further comprising: a lubricating assembly 20 connected inside the main reducer 12;

[0040] The drive axle plays a key role in the power transmission and operation control of the tractor. Its specific role is as follows: on the one hand, it can receive the engine torque transmitted by the universal transmission device of the tractor, and then transmit the torque to the drive wheels 14 through the main reducer 12, the differential 121, the half shaft 13 and other components, achieving the effect of reducing the speed and increasing the torque, so that the tractor can better adapt to the power demand under different working conditions;

[0041] On the other hand, the drive axle changes the transmission direction of the torque through the bevel gear pair in the main reducer 12 and the half shaft 13, and at the same time, uses the differential 121 to realize the differential function of the two drive wheels 14, so as to ensure that the two wheels can rotate at different speeds when the tractor turns or drives on uneven road surface, thereby improving the stability and flexibility of the tractor driving.

[0042] AsFigure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 As shown in the figure, the lubricating assembly 20 comprises a connecting shell 21 connected to the side of the main reducer 12, the inner wall of the connecting shell 21 is fixed with a connecting block 22, the inside of the connecting block 22 is provided with a containing cavity 221, the inside of the connecting block 22 is provided with a downward groove 224, the downward groove 224 and the containing cavity 221 are communicated through a flow port 222, the inside of the connecting block 22 is provided with a flow port 225, the channel of the flow port 225 is progressively arranged from large to small, the top of the connecting shell 21 is provided with a filling port, the inner wall of the filling port is threadedly connected with a closing screw 211, and the flow port 225 is provided with a one-way rubber sealing piece 229, one side of the connecting block 22 is provided with a groove 226, one side of the groove 226 is connected with a flow pipe 227 communicated with the flow port 225, one side of the groove 226 is connected with a baffle 228 through an adjusting assembly 30, the inside of the downward groove 224 and the inner wall of the connecting shell 21 are connected with a downward piece, the downward piece comprises an avoiding groove 223 provided on the side of the connecting block 22, the inner wall of the connecting shell 21 is fixed with a fixed column 24, the outer periphery of the fixed column 24 is slidably connected with a downward block 241 embedded in the downward groove 224, the outer periphery of the fixed column 24 is sleeved with a telescopic spring 242, the bottom of the downward block 241 is fixed with a contact block 243, the contact block 243 and the output shaft of the main reducer 12 are connected through a protruding block 23, when the downward block 241 is on the top of the inner wall of the downward groove 224, the bottom of the downward block 241 does not exceed the avoiding groove 223;

[0043] Before the lubricating operation of the bevel gear pair of the main reducer 12 and the half shaft 13, the closing screw 211 needs to be unscrewed, the lubricating oil is poured into the containing cavity 221, and then the closing screw 211 is tightened;

[0044] In the actual working process of the drive axle, the bevel gear pair of the main reducer 12 will drive the protruding block 23 to rotate synchronously when rotating, with the rotation of the protruding block 23, the protruding end of the protruding block 23 will push the contact block 243 to move upward, when the contact block 243 moves upward, it will drive the downward block 241 to move upward along the outer periphery of the fixed column 24 and extrude the telescopic spring 242, at the same time, in the process of upward movement of the downward block 241, it will move along the avoiding groove 223 and the downward groove 224, when the downward block 241 moves upward to the bottom and exceeds the flow port 222, the lubricating oil in the containing cavity 221 will flow into the downward groove 224 along the flow port 222, at this time, the lubricating oil flowing into the downward groove 224 will be closed by the one-way rubber sealing piece 229;

[0045] With the continuous rotation of the convex block 23, the convex end thereof will gradually be separated from the contact with the contact block 243, at this time, the elastic spring 242 in the extrusion state starts to rebound, pushes the downward block 241 and the contact block 243 to descend, ensures that the contact block 243 is always in contact with the convex block 23, at the same time, with the descent of the downward block 241, it will extrude the lubricating oil in the downward groove 224, so that the lubricating oil pushes the one-way rubber sealing piece 229 to open, and then makes the lubricating oil flow along the flow outlet 225 from large to small, due to the change of the caliber of the flow outlet 225, the flow rate of the lubricating oil will gradually increase during the flow process;

[0046] When the lubricating oil finally flows out along the flow pipe 227, it will be in contact with the baffle 228, after the lubricating oil is impacted, the liquid film becomes unstable and breaks, so that the lubricating oil is atomized, and these atomized lubricating oils diffuse in the drive axle housing 11, and play a lubricating role on the bevel gear pair of the main reducer 12 and the half shaft 13;

[0047] And, since the convex block 23 always rotates with the rotation of the bevel gear pair of the main reducer 12, when the rotation speed of the bevel gear pair of the main reducer 12 is high, the lubrication frequency of the bevel gear pair of the main reducer 12 and the half shaft 13 will increase, and when the rotation speed of the bevel gear pair of the main reducer 12 is low, the lubrication frequency will decrease accordingly, so that the bevel gear pair of the main reducer 12 and the half shaft 13 can be lubricated in real time according to the running working condition of the bevel gear pair of the main reducer 12 and the half shaft 13, and the friction heat generated by the friction between the bevel gear pair of the main reducer 12 and the half shaft 13 is effectively reduced.

[0048] As shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 8 、 Figure 9 , the adjusting assembly 30 comprises a micro electric push rod 31 installed on one side of the groove 226, the output end of the micro electric push rod 31 is connected with a circular plate 321, the side surface of the groove 226 is fixed with a guide rod 32, the inside of the circular plate 321 is provided with an opening 322, and the circular plate 321 is slidingly connected to the outer periphery of the guide rod 32, a sliding piece is connected between the circular plate 321 and the baffle 228, the sliding piece comprises an inclined block 33 fixed to the side surface of the connecting block 22 and a plurality of slot grooves 34 provided in the inside of the circular plate 321, the inner walls of the slot grooves 34 are fixed with a positioning rod 341, the outer periphery of the positioning rod 341 is slidingly connected with a sliding block 343 fixed to the baffle 228, the outer periphery of the positioning rod 341 is sleeved with an extrusion spring 342, the side surface of the baffle 228 is fixed with an abutting block 344, and the abutting block 344 is in contact with the slot grooves 34;

[0049] When the heavy load and high speed working condition is encountered, the previously atomized lubricating oil is not enough to effectively reduce the friction heat generated between the main reducer 12 conical gear pair and the half shaft 13, at this time, the micro electric push rod 31 needs to be started to shrink;

[0050] With the shrinkage movement of the micro electric push rod 31, it will pull the circular plate 321 synchronously, and the circular plate 321 will move, driving the baffle 228 connected thereto to move, in the process of moving the baffle 228, the side abutting block 344 of the baffle 228 will be in contact with the inclined block 33 on the side of the connecting block 22, the inclined block 33 will generate a pushing force on the abutting block 344, so that the abutting block 344 drives the sliding block 343 connected with the baffle 228 to slide on the outer periphery of the positioning rod 341, in this process, the sliding block 343 will compress the compression spring 342, so that the two baffles 228 gradually move away from each other;

[0051] At this time, the lubricating oil squeezed by the downward moving block 241 will push the one-way rubber sealing sheet 229 to open, and the lubricating oil will flow along the flow outlet 225 from large to small, due to the change of the caliber of the flow outlet 225, the flow rate of the lubricating oil will gradually increase in the process of flowing, when the lubricating oil finally flows out along the flow pipe 227, due to the absence of the baffle 228, the lubricating oil cannot be atomized as before, but flows out in the form of water droplets;

[0052] The lubricating oil flowing out in the form of water droplets can better adapt to the heavy load and high speed working condition, fully lubricate the main reducer 12 conical gear pair and the half shaft 13, significantly improve the lubrication effect, and further enhance the reduction of friction heat, which is helpful to ensure the stable operation of the drive axle in harsh working conditions.

[0053] Working principle: when the drive axle is actually working, the rotation of the conical gear pair of the main reducer 12 will synchronously drive the convex block 23 to rotate, in the process of rotating the convex block 23, the convex end of the convex block 23 pushes the contact block 243 to move upwards, and in turn drives the downward moving block 241 to move upwards along the outer periphery of the fixed column 24 and squeeze the extension spring 242, at the same time, the upward movement of the downward moving block 241 will move along the avoidance groove 223 and the downward moving groove 224, when the bottom of the downward moving block 241 exceeds the flow-through opening 222, the lubricating oil in the cavity 221 will flow into the downward moving groove 224 and be closed by the one-way rubber sealing sheet 229;

[0054] With the continuous rotation of the convex block 23, the convex end of the convex block 23 gradually separates from the contact block 243, the extension spring 242 in the squeezed state rebounds and pushes the downward moving block 241 and the contact block 243 to descend, keeping the contact block 243 in contact with the convex block 23, the downward moving block 241 squeezes the lubricating oil in the downward moving groove 224 when it descends, pushes the one-way rubber sealing sheet 229 to open, and the lubricating oil flows along the flow outlet 225 from large to small, and the flow rate gradually increases due to the change of the caliber;

[0055] The lubricating oil finally flows out along the flow pipe 227 and hits the baffle 228, the liquid film is broken and atomized, diffuses in the drive axle housing 11, lubricates the bevel gear pair of the main reducer 12 and the half shaft 13, and the lug 23 rotates with the bevel gear pair of the main reducer 12, the lubrication frequency increases when the rotating speed is high, and the lubrication frequency decreases when the rotating speed is low, so that the lubrication can be performed in real time according to the operation condition, and the friction heat is reduced;

[0056] When heavy load and high speed working conditions are encountered, the atomized lubricating oil is insufficient to reduce the friction heat, at this time, the micro electric push rod 31 is started to make it retract, the retracted micro electric push rod 31 pulls the circular plate 321 to drive the baffle 228 to move, the abutting block 344 on the side of the baffle 228 is in contact with the inclined block 33 on the side of the connecting block 22, the inclined block 33 pushes the abutting block 344 to make the sliding block 343 slide on the outer periphery of the positioning rod 341 and compress the compression spring 342, and the two baffles 228 gradually move away from each other;

[0057] At this time, the lubricating oil extruded by the downward moving block 241 pushes the one-way rubber sealing piece 229 to open, flows along the flow outlet 225 and the flow rate increases, and finally flows out along the flow pipe 227 without being blocked by the baffle 228, in the form of water droplets, this water droplet-shaped lubricating oil is more suitable for heavy load and high speed working conditions, can fully lubricate the bevel gear pair of the main reducer 12 and the half shaft 13, improve the lubrication effect, enhance the reduction of the friction heat, and ensure the stable operation of the drive axle under harsh working conditions.

[0058] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacement or change according to the technical concept of the multi-stage variable speed drive axle for tractors and the invention concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A multi-stage variable speed drive axle for a tractor, comprising a housing (10) including a drive axle housing (11) and a main reducer (12) connected to the side of the drive axle housing (11), a half shaft (13) being rotatably connected inside the drive axle housing (11), and an output end of the main reducer (12) being connected with the half shaft (13), characterized in that, Also include: The lubricating assembly (20) is connected to the side of the main reducer (12), the inner wall of the connecting shell (21) is fixed with a connecting block (22), the inner part of the connecting block (22) is provided with a cavity (221), the inner part of the connecting block (22) is provided with a downward groove (224), and the downward groove (224) is communicated with the cavity (221) through the flow port (222), the inner part of the connecting block (22) is provided with a flow outlet (225), and the flow outlet (225) is provided with a one-way rubber sealing piece (229), one side of the connecting block (22) is provided with a groove (226), one side of the groove (226) is connected with a flow pipe (227) communicated with the flow outlet (225), one side of the groove (226) is connected with a baffle (228) through an adjusting assembly (30), and the inner part of the downward groove (224) is connected with the inner wall of the connecting shell (21). The main reducer (12) rotates and drives the downward piece to move in the downward groove (224), and the lubricating oil is extruded to flow out along the flow outlet (225); The downward piece includes an avoidance groove (223) formed in the side of the connecting block (22), the inner wall of the connecting shell (21) is fixed with a fixed column (24), the outer periphery of the fixed column (24) is slidably connected with a downward block (241) embedded in the downward groove (224), the outer periphery of the fixed column (24) is sleeved with a telescopic spring (242), the bottom of the downward block (241) is fixed with a contact block (243), and the contact block (243) and the output shaft of the main reducer (12) are connected through a convex block (23); The adjusting assembly (30) includes a micro electric push rod (31) installed on one side of the groove (226), a circular plate (321) connected to the output end of the micro electric push rod (31), a guide rod (32) fixed on the side of the groove (226), an opening (322) formed in the inner part of the circular plate (321), and the circular plate (321) is slidably connected to the outer periphery of the guide rod (32), and the circular plate (321) and the baffle (228) are connected through a sliding piece; The sliding piece includes an inclined block (33) fixed on the side of the connecting block (22) and a plurality of grooves (34) formed in the inner part of the circular plate (321), the inner wall of the groove (34) is fixed with a positioning rod (341), and the outer periphery of the positioning rod (341) is slidably connected with a sliding block (343) fixed with the baffle (228), and the outer periphery of the positioning rod (341) is sleeved with an extrusion spring (342); The side of the baffle (228) is fixed with an abutting block (344), and the abutting block (344) is in contact with the groove (34). When the downward block (241) is on the top of the inner wall of the downward groove (224), the bottom of the downward block (241) does not exceed the avoidance groove (223).

2. The multi-speed drive axle for a tractor according to claim 1, characterized in that, The channel of the flow outlet (225) is progressively arranged from large to small, and the top of the connecting shell (21) is provided with a filling port, and the inner wall of the filling port is threadedly connected with a closing screw (211).

3. A multi-speed drive axle for a tractor as set forth in claim 2, characterized in that ​ 4. The multi-speed drive axle for a tractor as set forth in claim 1, wherein The shell (10) further comprises a differential (121) mounted on one side of the drive axle shell (11), and drive wheels (14) connected to both ends of the drive axle shell (11).

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